Hey Bella! I think that whenever someone has an idea for a book they should always pursue it and see how it goes! You won’t know for sure how it will turn out unless you start it first, right? Also, for the true love’s kiss idea, I think it may be slightly cliched since it’s used very often in previous books already but if you could find some way to make it unique to your own book then I’d say go for it! Hope this helped and sorry for the late reply!
-Ai